2019-05-19 14:07:45 +02:00
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# SPDX-License-Identifier: GPL-2.0-only
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2010-09-27 14:45:59 +02:00
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menu "IRQ subsystem"
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# Options selectable by the architecture code
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2011-03-08 19:52:55 +01:00
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# Make sparse irq Kconfig switch below available
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2012-01-26 03:02:40 +01:00
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config MAY_HAVE_SPARSE_IRQ
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2011-02-17 14:39:05 +01:00
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bool
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2010-09-27 14:45:59 +02:00
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2014-05-07 17:44:22 +02:00
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# Legacy support, required for itanic
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config GENERIC_IRQ_LEGACY
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bool
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2011-03-08 19:52:55 +01:00
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# Enable the generic irq autoprobe mechanism
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2010-09-27 14:45:59 +02:00
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config GENERIC_IRQ_PROBE
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2011-02-17 14:39:05 +01:00
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bool
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2010-09-27 14:45:59 +02:00
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2011-03-08 19:52:55 +01:00
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# Use the generic /proc/interrupts implementation
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2010-12-16 17:21:47 +01:00
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config GENERIC_IRQ_SHOW
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2011-02-17 14:39:05 +01:00
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bool
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2010-12-16 17:21:47 +01:00
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2011-03-25 16:48:50 +01:00
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# Print level/edge extra information
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config GENERIC_IRQ_SHOW_LEVEL
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bool
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2017-06-20 01:37:38 +02:00
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# Supports effective affinity mask
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config GENERIC_IRQ_EFFECTIVE_AFF_MASK
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bool
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2014-05-07 17:44:05 +02:00
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# Facility to allocate a hardware interrupt. This is legacy support
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# and should not be used in new code. Use irq domains instead.
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config GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
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bool
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2011-03-08 19:52:55 +01:00
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# Support for delayed migration from interrupt context
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2010-09-27 14:45:59 +02:00
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config GENERIC_PENDING_IRQ
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2011-02-17 14:39:05 +01:00
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bool
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2010-09-27 14:45:59 +02:00
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2015-09-24 11:32:13 +02:00
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# Support for generic irq migrating off cpu before the cpu is offline.
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config GENERIC_IRQ_MIGRATION
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bool
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2011-03-08 19:52:55 +01:00
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# Alpha specific irq affinity mechanism
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2010-09-27 14:45:59 +02:00
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config AUTO_IRQ_AFFINITY
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2011-02-17 14:39:05 +01:00
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bool
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2010-09-27 14:45:59 +02:00
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2011-03-08 19:52:55 +01:00
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# Tasklet based software resend for pending interrupts on enable_irq()
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2010-09-27 14:45:59 +02:00
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config HARDIRQS_SW_RESEND
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2011-02-17 14:39:05 +01:00
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bool
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2010-09-27 14:45:59 +02:00
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2011-03-08 19:52:55 +01:00
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# Preflow handler support for fasteoi (sparc64)
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2011-02-10 15:14:20 +01:00
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config IRQ_PREFLOW_FASTEOI
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2011-02-17 14:39:05 +01:00
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bool
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2011-02-10 15:14:20 +01:00
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2011-03-28 16:13:24 +02:00
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# Edge style eoi based handler (cell)
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config IRQ_EDGE_EOI_HANDLER
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bool
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2011-05-02 18:16:22 +02:00
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# Generic configurable interrupt chip implementation
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config GENERIC_IRQ_CHIP
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bool
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2014-01-31 01:50:10 +01:00
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select IRQ_DOMAIN
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2011-05-02 18:16:22 +02:00
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2011-07-26 11:19:06 +02:00
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# Generic irq_domain hw <--> linux irq number translation
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config IRQ_DOMAIN
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bool
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2017-08-14 16:53:16 +02:00
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# Support for simulated interrupts
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config IRQ_SIM
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bool
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select IRQ_WORK
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2014-11-06 15:20:14 +01:00
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# Support for hierarchical irq domains
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config IRQ_DOMAIN_HIERARCHY
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bool
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select IRQ_DOMAIN
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2017-08-18 02:53:31 +02:00
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# Support for hierarchical fasteoi+edge and fasteoi+level handlers
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config IRQ_FASTEOI_HIERARCHY_HANDLERS
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bool
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2015-12-08 14:20:14 +01:00
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# Generic IRQ IPI support
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config GENERIC_IRQ_IPI
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bool
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2014-11-12 11:39:03 +01:00
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# Generic MSI interrupt support
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config GENERIC_MSI_IRQ
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bool
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# Generic MSI hierarchical interrupt domain support
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config GENERIC_MSI_IRQ_DOMAIN
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bool
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select IRQ_DOMAIN_HIERARCHY
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select GENERIC_MSI_IRQ
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2019-05-01 15:58:18 +02:00
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config IRQ_MSI_IOMMU
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bool
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genirq: Add irq_domain-aware core IRQ handler
Calling irq_find_mapping from outside a irq_{enter,exit} section is
unsafe and produces ugly messages if CONFIG_PROVE_RCU is enabled:
If coming from the idle state, the rcu_read_lock call in irq_find_mapping
will generate an unpleasant warning:
<quote>
===============================
[ INFO: suspicious RCU usage. ]
3.16.0-rc1+ #135 Not tainted
-------------------------------
include/linux/rcupdate.h:871 rcu_read_lock() used illegally while idle!
other info that might help us debug this:
RCU used illegally from idle CPU!
rcu_scheduler_active = 1, debug_locks = 0
RCU used illegally from extended quiescent state!
1 lock held by swapper/0/0:
#0: (rcu_read_lock){......}, at: [<ffffffc00010206c>]
irq_find_mapping+0x4c/0x198
</quote>
As this issue is fairly widespread and involves at least three
different architectures, a possible solution is to add a new
handle_domain_irq entry point into the generic IRQ code that
the interrupt controller code can call.
This new function takes an irq_domain, and calls into irq_find_domain
inside the irq_{enter,exit} block. An additional "lookup" parameter is
used to allow non-domain architecture code to be replaced by this as well.
Interrupt controllers can then be updated to use the new mechanism.
This code is sitting behind a new CONFIG_HANDLE_DOMAIN_IRQ, as not all
architectures implement set_irq_regs (yes, mn10300, I'm looking at you...).
Reported-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Link: https://lkml.kernel.org/r/1409047421-27649-2-git-send-email-marc.zyngier@arm.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2014-08-26 12:03:16 +02:00
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config HANDLE_DOMAIN_IRQ
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bool
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2017-06-23 16:11:07 +02:00
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config IRQ_TIMINGS
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bool
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2017-09-13 23:29:14 +02:00
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config GENERIC_IRQ_MATRIX_ALLOCATOR
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bool
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2017-10-17 09:54:57 +02:00
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config GENERIC_IRQ_RESERVATION_MODE
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bool
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2011-03-08 19:52:55 +01:00
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# Support forced irq threading
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2011-02-24 00:52:23 +01:00
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config IRQ_FORCED_THREADING
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bool
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2010-09-27 14:45:59 +02:00
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config SPARSE_IRQ
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2012-01-26 03:02:40 +01:00
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bool "Support sparse irq numbering" if MAY_HAVE_SPARSE_IRQ
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2010-09-27 14:45:59 +02:00
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---help---
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Sparse irq numbering is useful for distro kernels that want
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to define a high CONFIG_NR_CPUS value but still want to have
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low kernel memory footprint on smaller machines.
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( Sparse irqs can also be beneficial on NUMA boxes, as they spread
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out the interrupt descriptors in a more NUMA-friendly way. )
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If you don't know what to do here, say N.
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2017-06-20 01:37:17 +02:00
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config GENERIC_IRQ_DEBUGFS
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bool "Expose irq internals in debugfs"
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depends on DEBUG_FS
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default n
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---help---
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Exposes internal state information through debugfs. Mostly for
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developers and debugging of hard to diagnose interrupt problems.
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If you don't know what to do here, say N.
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2010-09-27 14:45:59 +02:00
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endmenu
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2018-03-08 00:57:27 +01:00
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config GENERIC_IRQ_MULTI_HANDLER
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bool
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help
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Allow to specify the low level IRQ handler at run time.
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